Cut-off mechanism for firearms



Patented Aug. 25, 1925.

UNITED STATES PATENT OFFICE.

CARI GUSTAF SWEBILIUS, OF NEW HAVEN, CONNECTICUT, ASSIGNOR T0 THE MARLINFIREARMS CORPORATION, OF NEW HAVEN, CONNECTICUT, A CORPORATION OFDELAWARE. v

CUT-OFF MECHANISM FOR FIREARMS.

Applicationled April 4, 1922.- Serial' No. 549,411.

. To all 'whom it may concern.'

Be it known that I, CARL G. SWEBILIUs, a citizen of the United States ofAmerica` residing at New Haven, in the county of New Haven, State ofConnecticut, have invented certain new and useful Improvements inCut-Off Mechanisms for Firearms, of which the following is a full,clear, concise, and exact description.

This invention relates to firearms and particularly to an improved meansfor controlling the feeding of cartridges from the magazine to thecarrier in repeating shot guns of the general type disclosed in the U.S. Letters Patent to L. L. Hepburn, 943,828 granted December 21, 1909 towhich patent attention is directed for a detailed description of theconstruction and operation of the main working parts.

Repeating firearms of this type have a tubular magazine communicatingwith the receiver and it has been the practice to provide a cartridgecut olf member and a cartridge release member for controlling thefeeding of cartridges from the magazine to the carrier.

It is an object of this invention to improve upon the structurearrangement and means of operating the cartridge cut ofi member.

Another object of the invention is to so arrange the cut off member thatit is in its vinoperative position only when the breech of the gun isclosed.

Another object of the invention is to locate the cut ofi' member on theopposite side of the receiver from the release member and to so arrangethe means for o erating it that the magazine may be emptie of shellswith the minimum effort.

Other objects and novel features of the invention will be apparent fromthe following specification and accompanying drawings, in which Fig. 1is a side elevation of the receiver with the carrier removed and thebreech bolt near its rear position, the removable side plate beingpartially broken away;

and Fig. 2 is a plan view, partially in section of the receiver with theremovable side wall and breech bolt in position, the section being takenpartially through the lower portion of the action rod and partiallyabove the lower edge of the ejection opening, and Fig. 3 is a section online 3-3 of Fig. 2.

The receiver 10 comprises an integral side wall 11 anda removable sidewall 12. Attached to the rear wall of the receiver is the stock 13 andthreaded in the front wall is the barrel 14. Arranged beneath the barrel14 and communicating with the lower portion of the receiver is a tubularmagazine 15 from which the cartridges are fed to a carrier, not shown,which in turn presents the cartridges in position to be chambered by thebreech bolt.

In the wall 11 is provided a slot in which slides the action rod 16, therear under portion of which is cut away to form a groove 17 whichterminates at its forward end in an oblique shoulder 18. A cartridgerelease member 19 is pivotally mounted on a pin 2O in a suitable groovein the wall 12. This member has a lug 21 on its forward end which isadapted to extend into the path of a cartridge passing from the magazineto the carrier, to act as a stop. From the rear end of the member 19there extends upwardly an arm 22 which projects beyond the lower edge ofthe action rod slot and which is adapted to extend into the groove 17and be engaged by the shoulder 18 to rock the member 19. A spring 23presses the forward end of the member 19 toward the interior of thereceiver. Vhen the action rod is in its forward'position the lug 21 isprojected into the path of a cartridge by the spring 23 and the arm 22lies in the groove 17. As the action rod is moved rearwardly, theoblique shoulder 18 engages the arm 22 and rocks the member 19, therebyremoving the lug 21 from the path of a cartridge to allow the magazinesprinfr (not shown) to thrust the cartridge onto t 1e carrier.

In a slot in the removable side wall 12 is pivotally mounted a cut-ofi3member 24 which has a lug 25 adapted to be projected into the path of acartridge by the spring 26. The lug 25 is arranged closer to the mouthof the magazine than is the lug 21 so that a cartridge first engages thelug 21 in its travel from the magazine to the carrier. The upper frontportion of the side wall 12 is cut away to ,form an ejection opening forexploded shells. The upper inner portion of wall 12 is cut away toprovide a shoulder 26 on which slides the closure 27 for the ejectionopening, the closure being attached to and movable with the breech bolt28. The upper end of the cut-olf member 24 extends slightly above theshoulder 26 and is cut away to provide a lug 30, the face of whichadjacent the wall 12 is adapted to be engaged by the tapered front edgeof the closure 27 to rock the member 24 thereby removing the lug fromthe path of a cartridge and allowing the magazine spring to feed acartridge against the lug 21.

The operation of this devlce is as follows: n

Starting with the breech closed, the cutoff member 24 is held in itsinoperative position, since the closure 27 has engaged the lug androcked the cut-cti member against the action of its spring. The lug 25is therefor retracted out of the path of a cartridge and the cartridgeis permitted to move into engagement with the lug 21 of the cartridgerelease 19, the latter having been moved into its operative position byits spring 28, this movement being possible since the action rod is inits forward position whereby the arm 22 lies in the groove 17 of theaction rod. The breech is then opened and the shell ejected from thegun. This is accomplished in the well-known manner by operating thebreech bolt through the medium of the action rod. As the breech boltmoves rearwardly, the closure 27 is disengaged from the lug 30. Thecut-ofi' member 24 does not immediately swing into operative position asthe lug 25 is now engaged with the cartridge held by the lug 21. IVhenthe breech bolt nears the rear end of the receiver, the shoulder 18engages the arm 22 of the cartridge release 19 to rock the lug 21 out ofthe path of the cartridge. The cartridge then is advanced onto thecarrier (not shown) and the lug 25 is disengaged therefrom, allowing thecut-off member 24 to be moved into operative position by its spring. Thebreech bolt now is returned to its forward position. The arm 22 ridesdown the shoulder 18 and the lug 21 is projected into cartridge engagingposition. As the breech bolt approaches its closed position, the frontedge of the closure 27 engages the lug 30 rocking the cut-off member 24:to disengage the lug 25 from the next cartridge to allow it to be fedagainst the lug 21.

The arrangement of the cut-oii on the side of the receiver opposite therelease prevents the possibility of a cartridge being twisted into ajamming position by the magazine spring since it is first engaged at onepoint and then at a point diametrically opposite. Any tendency ot thecartridge to work out of alinement is thus overcome. As the cutoti' ismaintained inoperative when the gun is breeched, the magazine may beemptied by merely actuating the release through the medium of a buttonin the usual manner. The

the gun insures that a cartridge is fed against the release in plenty oftime and also is prevented from being fed against the release during thereloadino' of the gun. This is of importance when s ooting rapidly as itprevents the possibility of the gun developing a feed jam.

It is oi' course, understood that various modifications may be made inthe structure without in any way departing from the spirit of theinvention as set forth in the appended claims.

lVhat is claimed is:

1. In a firearm, a receiver having an ejection opening' in one sidewall, a breech mechanism, an action rod for actuating said breechmechanism, a slide operable by said breech mechanism to close saidopening when the firearm is breeched, a magazineV communicating withsaid receiver, a cut-oit member pivotally mounted on said side wall andadapted to project into said receiver, and means on said cut-ofi' memberto be engaged by said slide to rock said member.

2. In a firearm, a receiver having side walls, a breech mechanism insaid receiver, a cut-ofi member in one of said walls, a release memberin the other wall, an action rod, means on said action rod for actuatingone of said members, and a member movable with said breech mechanism foractuating said other member.

8. In a firearm, a receiver having an ejector opening in one wall, abreech bolt reciprocatively mounted in said receiver, an

action rod for actuating said breech mechanism, a slide attached to saidbreech bolt and adapted to close said aperture and a cut-ofi' memberivotally mounted on said wall and extending above the edge of saidaperture to be engaged by said slide.

et. In a firearm, a receiver having an opening in one wall, a breechmechanism reciprocatively mounted in said receiver, an action rod foractuating said breech mechanism, a cut-olf member mounted on a pivotparallel to the path of reciprocation of said breech mechanism andhaving an arm projecting into said opening, a slide movable with saidbreech mechanism and adapted to close said opening, said slide having atapered edge to contact with said arm to actuate said cutoii' member.

In witness whereof I hereunto sign my name this 18th day of March, 1922.

CARL GUSTAF SVVEBILIUS`

